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CHEMICAL RESISTANCE

Resistance test data by immersion on a variety of chemicals at a temperature of 20°C.

Disclaimer

Our data sheets and sales literature are issued for the purpose of supplying general product information. In view of the variation of conditions under which products may be used or this information may be applied, we cannot accept responsibility for loss, damage or accident of any nature [or infringement of patent rights] which may result from the use of application of the information or the products. For specific confirmation of any details in the product information or use and application please apply to the company in writing.

POWDER TYPES & SUITABILITY

EPOXY EPOXY POLYESTER
HARDNESS Excellent Very Good
FLEXIBILITY Excellent Excellent
OVERBAKE STABILITY Fair Excellent
CORROSION PROTECTION Not recommended Excellent
CHEMICAL RESISTANCE Excellent Very Good
APPLICATION PROPERTIES Excellent Very Good
+ Good Resistance± Limited Resistance Poor Resistance
TYPES & SUITABILITY EPOXY EPOXY - POLYESTER POLYESTER
Fresh Water + + +
Salt Water + + +
Sulphuric Acid 10% + + +
Sulphuric Acid. Conc. - - -
Hydrochloric Acid 10% + + +
Hydrochloric Acid. Conc. ± ± ±
Nitric Acid 10% ± - -
Nitric Acid. Conc. - - -
Phosphoric Acid 50% + + +
Caustic Soda 10% + ± +
Caustic Soda 30% + - ±
Ammonia 10% ± ± ±
Acetic Acid 10% + + +
Tartaric Acid 5% + + +
EPOXY EPOXY - POLYESTER POLYESTER
Lactic Acid 10% + + +
Ethyl Alchohol 96% + + +
Mehyl ethyl ketone ± - -
Acetone - ± -
Petroleum + + +
Trichloroethylene - - -
Glycerine + + +
Triethylamine + + +
Toulene + ± ±
Methyl Chloride - - -
Hydrogen Peroxide 3% ± - -
Cyclohexanone - - -
Linseed Oil + + +
Penetrating Oil + + +

These can physically get in between the powder and the object that is being coated causing the coating to not bond. Care must be taken to ensure that the object to be coated is properly cleaned.

Powder Coatings will not stick to oily, greasy or waxy surfaces. Feeling the surface to detect oils is not good enough as oils cannot always be detect in this way. High pressure water cleaning and grit blasting do not guarantee to remove oils use of a degreasing chemical is usually the best solution.

Moisture can be a problem in both the form of water droplets and high humidity. Moisture can be both static and migrating. Care must be taken to ensure that the correct powder is used for this situation as many powders will fail to stick to damp surfaces and where moisture migrates water filled blisters can often be generated.

HEALTH & SAFETY INFORMATION

Documentation about the Health & Safety aspects of Thermosetting Powders covering areas such as hazards, explosion, toxicity etc. Also includes Materials Safety Data Sheets.

There are many reasons why coatings fail and this can normally be attributed to poor application and inept quality assurance practices. Below are a list of why the powder coating process might fail.

Ultra Violet radiation from the Sun will breakdown many coatings. Coatings may discolour, get brittle and crack.

These can be underneath the powder at coating time and can cause corrosion to the object leading to early failure of the coating. This endorses the need for a good working environment with rigid procedures.

A single layer of coating runs the risk of pinhole size coating failures. These permit chemicals to attack the unprotected surface and the bonding. Again, this puts the focus on quality assurance and procedures.

Some coatings are more brittle than other, overly brittle coatings my crack or chip.

Different type of coating handles abrasion and wear to differing extents. It is important to select the correct kind of coating to take account of wear and tea.

Hazards

The principle hazards which may be involved in the application of powder are explosion and toxicity.

Explosion

A powder explosion can occur under the following conditions:

  • When the concentration of powder in the air is above the lowest level capable of being exploded. All relevant information currently available coating powder gives 10 grams per cubic metre.
  • A source ignition of sufficient energy is present. This could be a hot surface, a flame, an electrical spark, or electrostatic discharge.

Because it is difficult to totally eliminate all sources of ignition, most reliance should be placed on keeping the concentration of powder in the application booth below 10 grams per cubic metre.

Toxicity

Powder coating normally supplied i.e. Epoxy, epoxy-polyester and polyester, all show a low order of systemic toxicity. Systemically its toxicity is relatively low.No Thermaset products contain any chrome or cadmium pigments

Coating powders are generally less likely to cause dermatitis than liquid coatings but can still affect the skin. Persons who develop a continued reaction should not work with powder.

Disposal

The disposal of quantities of coating powder should be undertaken by reference to the local authority under the terms of the “Disposal of Poisonous Waste Act 1972”.

Industrial Hygiene and Good Working Practice

The standard of housekeeping and spray booth air extraction performance should be such that powder dos not escape into the workroom or accumulate in the booth.

  • Floors and fittings should be kept clean with a suitable vacuum cleaner.
  • Ensure operators are properly earthed.
  • Do not use insulating gloves or footwear.
  • Antistatic footwear to EN 61340-5-1 is available.
  • In case of fire, carbon dioxide extinguishers should NOT be used.
  • To prevent inhalation of airborne powder, face masks capable of removing respirable dust should be worn.
  • Persons with chronic respiratory complaints should not work with powder.
  • Use only soap and water, never organic solvents, to cleanse the skin of powder.
  • Compressed air should never be used to remove powder from the hands or clothing.

References

Code of Safe Practice published by the Paint makers Association of Great Britain “Application of Powder Coatings by Electrostatic Spraying”. Copies are available on request.

H&S at Work Booklet 22,
Dust Explosions in Factories.

Our data sheets and sales literature are issued for the purpose of supplying general product information. In view of the variation of conditions under which products may be used or this information may be applied, we cannot accept responsibility for loss, damage or accident of any nature [or infringement of patent rights] which may result from the use of application of the information or the products. For specific confirmation of any details in the product information or use and application please apply to the company in writing.